48 CRUSTACEA COPEPODA. II. 
with any certainty in D. frigidus, but in D. gobinus each leg is present as an exceedingly minute protuberance 
terminating in a single seta; fifth legs are distinctly biramous in D. gobinus (fig. 7b), but whether the same 
is the case in D. frigidus could not be decided. — The spine on the end of each caudal ramus is straight and 
moderately long in D. frigidus (fig. 8c), conspicuously longer, thicker, and besides much curved upwards 
in D. gobinus (fig. 7 b). 
Length (in curved condition) 0.8 mm. 
Occurrence. — Taken by the “Ingolf’”’ at a single station in the cold area. 
East of Iceland: Stat. 102: Lat. 66°23’ N., Long. 10°26’ W., 750 fathoms, temp. +0.9°; 2 females 
with males on the inner side of the operculum of a specimen of Lycodes frigidus. 
60. Diocus gobinus O. F. Mill. 
(Pl. III, figs. 7 a—7 c.) 
1776. Lernea gobina O. F. Miiller, Zool. Danicee Prodromus, p. 226. 
1777—79. — — O.F. Miler, Zool. Danica, I, p. 39; Tab. XX XIII, fig. 3. 
1780. — — O. Fabricius, Fauna Groenl. p. 339. 
1837. Chondracanthus gobinus Kroyer, Nat. Tidsskr. B. I, p. 280, Tab. II, fig. 8; Tab. III, fig. 12, a—b. 
!r86r. Diocus —  Steenstrup & Liitken, Kgl. D. Vid. Selsk. Skr. 5. Rekke, naturv. og 
math. Afd. B.5, p. 423, Tab. XV, fig. 39. 
1863. —- — Kroyer, Nat. Tidsskr. 3. Rekke, B. II, p. 333. 
The female is well known from the text and good figures given by Steenstrup & Liitken, together 
with Kroyer’s description in 1863. The male has been rather well figured by Steenstrup & Liitken, but the 
remarks set forth above on this animal in the description of D. frigidus, together with figs. 7 a and 7 b may 
serve as an addition. 
Larval Male. Fig. 7c represents the single specimen observed (found by Dr. Wesenberg-Lund 
on an immature female); unfortunately it was only moderately well preserved, with the result that some 
particulars, especially in the natatory legs, could not be made out with certainty. It is a Cyclopid-stage; the 
animal is 0.44 mm. long. 
Cephalothorax rather oblong. — The abdomen considerably more than half as long as cephalothorax 
and consists of five segments; the caudal rami are somewhat small, a little longer than broad, each with a 
very long and proximally robust seta, and besides a moderately short seta. 
The antennule considerably less than half as long as the cephalothorax, shaped and articulated as 
in the adult male; only the three or four distal joints, together scarcely half of the antennula, are distinctly 
marked off. — Antenne as in the adult, consisting of a very robust joint with a long, strong, curved claw; 
the exopod is well developed and terminates in a hook-shaped spine. — Maxille reminding of those in the 
adult. — Maxillipeds somewhat long and rather slender; third joint and claw together nearly as long as second 
joint. — Two pairs of natatory legs are well developed and nearly similar; in both pairs their rami — as far 
as could be made out — are two-jointed, second joint longer and broader than the first, with about 6 marginal 
spines. 
